There are multiple definitions:

1. sagittal vertical axis(English)

   • the measurement of the horizontal distance between the C7 plumbline and the vertical line passing through the upper posterior edge of S1
   • PI, ODI, TPA, LKA, PFSUP, PSF, SCOVF, VAS, VP, ASD, CoCr, LL, MRC, PJK, TK, TRC, UIV, ASK, LCA, TL, CC, cMIS, MIS, PI-LL, SVA
   • Biophysics, Musculoskeletal system, Spine (or spinal cord), Orthopedics, Medical imaging
   • https://doi.org…-3984.2019.0048
   • https://doi.org…-0701-4.00031-2
   • https://doi.org…39.2023.2257780
   • https://doi.org…20.5.FOCUS20192
   • https://doi.org…-1892.202307021
   • https://doi.org…21.7.SPINE21138

2. supraventricular arrhythmia(English)

   • prevalence is 2.5/1000, increasing with age and more often in women
   • AF, APD, ECG, VA, VT, AFL, AT, AVNRT, AVRT, PAC
   • Cardiology, Electrophysiology, Woman /female
   • https://doi.org…-2856-5.00121-7